CN112945373A - Method for correcting corona noise sound power of alternating current transmission line in Tibet plateau area - Google Patents
Method for correcting corona noise sound power of alternating current transmission line in Tibet plateau area Download PDFInfo
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Abstract
The invention discloses a method for correcting corona noise sound power of an alternating current transmission line in a Tibet plateau area, which comprises the following steps: s1, conducting a corona cage test on the conducting wire at different altitudes, and measuring an audible noise sound pressure value generated by corona discharge by using a B & K noise measuring system; s2, converting the measured sound pressure data into sound power by a sound power corona cage analysis method; and S3, fitting the sound power of the wire with different splitting numbers and different diameters of the sub-wires to obtain a sound power correction method. The method for correcting the sound power of the corona noise of the alternating-current transmission line in the Qinghai-Tibet plateau area has the characteristics of more comprehensive measurement data and accurate and reliable audible noise prediction.
Description
Technical Field
The invention relates to the technical field of high-voltage alternating-current power transmission, in particular to a correction method for corona noise sound power of an alternating-current power transmission line in a Tibet plateau area.
Background
The energy and economic development of China are unbalanced, and a power transmission channel mainly based on an ultra-high voltage and extra-high voltage power transmission technology needs to be built. The western energy enrichment area is located on the plateau, the environmental climate is complex, and the construction of the power transmission line inevitably needs to penetrate the high altitude area. Meanwhile, 750kV networking projects in northwest of China, Qinghai-Tibet networking projects, Chuanghai-Tibet networking projects and the like are also mostly operated in high altitude areas. Compared with plain areas, high-altitude areas have low atmospheric pressure, low air density and increased electron mean free path, so that the energy accumulated before electron collision is increased, effective collision ionization is easier to occur, and corona discharge phenomenon is more severe, therefore, the problem of audible noise of a high-voltage transmission line is more serious, the audible noise is easy to be directly felt by residents nearby the line, subjective annoyance is higher, and disputes and complaints caused by the audible noise are remarkably increased, and the audible noise is gradually a main factor for limiting the construction of ultra-high voltage and extra-high voltage alternating current engineering in China. Therefore, accurately predicting and suppressing the audible noise effect of the high voltage ac transmission line has become a significant technical problem that must be considered in the design, construction and operation of the high voltage ac transmission line in high altitude areas.
Most of audible noise altitude correction methods adopted in the prior art utilize actual lines or test line segments for research, the type of a conducting wire is single, data of two altitude areas are generally adopted for comparison, the data volume is deficient, the accuracy is not high, and meanwhile, test data of the area with the altitude above 2000m are few. For the ultra-high voltage and extra-high voltage alternating current lines in high altitude areas, more than 4-split conductors are generally adopted, and the altitudes of most areas in Qinghai-Tibet plateau of China are more than 2000m, so that the method provided by the research can not meet the requirements of the construction of the high altitude alternating current transmission lines of China. Because inaccurate audible noise prediction can lead to stricter design of audible noise limit values of some projects, the investment of the whole project is greatly increased, or the audible noise design of some projects is looser, so that the overproof phenomenon occurs after the project is put into operation. Therefore, the audible noise level of the alternating current line in the high altitude area of China cannot be simply predicted by applying foreign correction formulas, and a large amount of actual measurement of the audible noise power of the common conducting wires of the alternating current lines at different altitude points of China is carried out according to the actual situation of China, so that the high altitude audible noise power correction method suitable for China is obtained. Based on the above problems, it is urgently needed to provide a new method for correcting the acoustic power of the corona noise of the ac transmission line, so as to meet the requirement of building the ac transmission line at high altitude in China.
Disclosure of Invention
The invention aims to provide a correction method for the sound power of corona noise of an alternating current transmission line in Qinghai-Tibet plateau areas, and provides a new correction method for the sound power of audible noise based on altitude and measured data by carrying out audible noise sound power measurement on 6 common split conductors in 4 typical altitude areas in China.
In order to achieve the purpose, the invention provides the following scheme:
a method for correcting corona noise sound power of an alternating current transmission line in a Tibet plateau area comprises the following steps:
s1, conducting a corona cage test on the conducting wire at different altitudes, and measuring an audible noise sound pressure value generated by corona discharge by using a B & K noise measuring system;
s2, converting the measured sound pressure data into sound power by a sound power corona cage analysis method;
and S3, fitting the sound power of the wire with different splitting numbers and different diameters of the sub-wires to obtain a sound power correction method.
Optionally, in step S1, a corona cage test is performed on the wire at different altitudes, and a B & K noise measurement system is used to measure an audible noise sound pressure value generated by corona discharge, which specifically includes:
s101, applying high voltage to the wires in the corona cage through a high-voltage lead in a heavy rain state, and generating high electric field intensity on the surfaces of the wires for simulating corona discharge of an actual high-voltage line;
s102, collecting a sound signal by using a sound pressure sensor in a B & K noise measurement system and converting the sound signal into an electric signal;
s103, collecting the electric signals by using a B & K Data collecting unit in the B & K noise measuring system, monitoring and storing the electric signals through Time Data Recorder software after simple processing, performing FFT (fast Fourier transform) and processing analysis on the measured sound wave signals by selecting Reflex software, eliminating the interference of external environment noise, and obtaining audible noise sound pressure Data generated by wire corona discharge through spectral analysis and calibration.
Optionally, in step S2, the sound pressure data measured by the sound power corona cage analysis method is converted into sound power, where the specific derivation process of the sound power corona cage analysis method includes:
s201, assuming that corona discharge points on the surface of the wire in the corona cage are uniformly distributed along the wire, and the sound power generated by the wire with the dx length is constant A0When a wire of dx length is used as a point sound source, noise propagates to the surroundings in the form of spherical waves, and the acoustic energy at a distance D from the wire is calculated as follows in consideration of the reflection of the acoustic waves from the ground:
in the formula, A0The power generated by noise of a wire with a dx length, L is the length of the wire, k is the earth reflection coefficient, D is the distance between the midpoint of the wire and the measuring point, DiThe distance between the line mirror image and the measuring point is taken as the distance;
s202, directly measuring data in a corona cage test to be sound pressure P, wherein the sound pressure and the sound energy have the following relation:
in the formula, delta is relative air density, c is the propagation speed of sound waves in the air, and 344m/s is taken;
s203, performing simultaneous calculation on the formulas (1) and (2) in the steps S201 and S202 to obtain sound pressure P and sound power A0The operational relationship between them is as follows;
in the formula (4), H is an external factor influence parameter;
and S204, substituting the measured audible noise sound pressure data P into formula (3) to obtain the sound power level of the corona discharge of the conductor, and comparing the sound power to obtain the audible noise levels generated by the corona discharge of different split conductor bundles.
Optionally, the modification formula of the acoustic power modification method in step S3 is as follows:
in the formula, Δ is an audible noise sound power correction coefficient, and x is an altitude difference between the measurement point and the altitude 23 m.
Optionally, the different altitudes in step S1 specifically include: wuhan 23m, Tianshui 1100m, Xining 2261m, Hehe 2943m and Yangyu 4300 m.
Optionally, the conducting wire in step S101 is a multi-split conducting wire, the multi-split conducting wire adopts 6 different types of conducting wires in total, the number of the conducting wire splits is from 4 to 8, the diameter of the sub-conducting wire is from 26.8mm to 36.6mm, and the fixed conducting wire split distance is 400mm, the conducting wire is 4 × LGJ400, 6 × LGJ500, 6 × LGJ630, 8 × LGJ400 and 8 × LGJ 630.
Optionally, the artificial rain device is erected above the corona cage wall, and is provided with a water valve and a spray head which are used for controlling rainfall.
Optionally, when corona cage test measures in step S101, high voltage capacitor selects C3333 pF electric capacity, and is three-section 10000pF electric capacity parallelly connected, and rated voltage is 600kV, and the operational environment is outdoors.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: the invention provides a correction method of the sound power of the corona noise of an alternating current transmission line in the Qinghai-Tibet plateau area, which develops an audible noise corona test from 5 different altitude points from low altitude to high altitude, the audible noise sound power level actual measurement and calculation are carried out on the 6 lead combinations under heavy rain conditions, by carrying out comparative analysis on the audible noise sound power value of each altitude area and carrying out regression research, the audible noise sound power correction method is provided, the accurate correction of the wire corona discharge audible noise level of the high altitude area is realized, and the method is more accurate and reliable, therefore, unnecessary cost increase or over-standard audible noise level caused by inaccurate prediction in the prior art to the project is avoided, support is provided for the construction of alternating current transmission lines in Qinghai-Tibet plateau areas in China, and the method has the characteristics of more comprehensive measurement data and accurate and reliable audible noise prediction.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic diagram of the measurement of audible noise sound power of a movable corona cage of the correction method for the corona noise sound power of an alternating current transmission line in Qinghai-Tibet plateau;
FIG. 2 is a schematic diagram of a B & K noise measurement system of the correction method for the corona noise sound power of the AC transmission line in Tibet plateau area;
FIG. 3 is a noise amount spectrum analysis chart of the correction method for the acoustic power of the corona noise of the AC transmission line in the Qinghai-Tibet plateau area
Fig. 4 is a schematic diagram of an actual measurement value and a formula fitting value of an audible noise sound power correction coefficient of the alternating current transmission line corona noise sound power correction method in the Qinghai-Tibet plateau area;
FIG. 5 is a schematic diagram of measured values and formula fit values for audible noise acoustic power correction coefficients for a United states BPA;
FIG. 6 is a flow chart of the calculation of the audible noise sound power in the high altitude area of Qinghai-Tibet plateau according to the present invention;
description of reference numerals: 1. a corona cage; 2. a wire; 3. a B & K data acquisition unit; 4. a sound pressure sensor; 5. and (4) a computer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a correction method for the sound power of corona noise of an alternating current transmission line in Qinghai-Tibet plateau areas, and provides a new correction method for the sound power of audible noise based on altitude and measured data by carrying out audible noise sound power measurement on 6 common split conductors in 4 typical altitude areas in China.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The invention provides a correction method of the acoustic power of corona noise of an alternating current transmission line in Qinghai-Tibet plateau areas, which utilizes a movable corona cage to measure the acoustic power of audible noise of 6 common split conductors in 4 areas with typical altitude in China, namely, Tianshui (1100m), Xining (2261m), Cound (2943m) and Yangbing (4300m), and provides a correction method of the acoustic power of the audible noise in high altitude areas; the invention provides a correction method of corona noise sound power of an alternating current transmission line in a Qinghai-Tibet plateau area; the measurement method of the corona cage test is shown in figure 1, the section of the corona cage 1 is 6m multiplied by 6m, the length is 10m, an artificial rain device is erected above the wall of the corona cage 1, and the rainfall can be controlled through a water valve and a spray head; during test measurement, the high-voltage capacitor selects Cc which is 3333pF and is formed by connecting three 10000pF capacitors in parallel, the rated voltage is 600kV, and the operation environment is outdoor; the invention provides a method for correcting the sound power of corona noise of an alternating current transmission line in a Qinghai-Tibet plateau area, which comprises the following steps:
s1, conducting a corona cage test on the lead 2 at different altitudes, and measuring an audible noise sound pressure value generated by corona discharge using a B & K noise measurement system, including:
s101, applying high voltage to the wires 2 in the corona cage 1 through a high-voltage lead in a heavy rain state, and generating high electric field intensity on the surfaces of the wires 2 for simulating actual high-voltage line corona discharge;
s102, as shown in figure 2, a sound pressure sensor 4 in a B & K noise measurement system is used for collecting sound signals and converting the sound signals into electric signals, the sensitivity of the sound pressure sensor 4 adopted in the test is 50mV/Pa, and the effective frequency range is 1-40 kHz;
s103, collecting the electric signals by using a B & K Data collecting unit 3 in the B & K noise measuring system, transmitting the electric signals to a computer 5, monitoring and storing the electric signals by using Time Data Recorder software after simple processing, and performing FFT (fast Fourier transform) and other processing analysis on the measured sound waves by using software such as Reflex (Reflex) and the like in the later stage;
the invention adopts a movable corona cage to carry out audible noise power test, adopts a plurality of noise probes to carry out multichannel synchronous measurement, can effectively obtain background noise and corona noise, eliminates the interference of external environment noise to the maximum extent through data processing in the test process, simultaneously utilizes a plurality of pairs of spectrum noise measuring equipment to carry out detailed spectrum analysis on the noise quantity generated by corona discharge of a conducting wire, takes a 6 XLGJ 400 conducting wire as an example, as shown in figure 3, obtains the relation between 8kHz and the noise A sound level through noise frequency analysis, and is shown in the following table:
TABLE 1
Then, through calibration, audible noise generated by corona discharge of the conducting wire is accurately acquired, and noise measurement errors are reduced;
the five specifically selected altitude test sites of the invention are respectively:
wuhan, the national grid company, Wuhan extra-high voltage AC test base, is located in south of Phoenix mountain in the summer area of Wuhan city, Hubei province, and has an altitude of 23 m; the elevation height of the wheat area in Tianshui city of Gansu province is 1100 m; xining, Qinghai electric power saving training center, located in the small isthmus town of peace county of Xining city, Qinghai province, with an altitude of 2261 m; the Hanneng Hainan state photovoltaic industrial park is located in a Potta Town photovoltaic industrial park of autonomous State Council county of Hainan Tibetan of Qinghai province, and has the altitude of 2943 m; the sheep octawell is a Tibet high-altitude test base of a national grid company, is located in the town of sheep octawell of Lasa city in autonomous region of Tibet, and has an altitude of 4300 m;
the audible noise corona test of an altitude area of more than 3000m is not carried out at home and abroad, only linear fitting between two points is carried out through the measurement data of about 2000m and the low altitude data, and the accuracy is not high;
the type of wire 2 used in the test was as follows: 4 xlgj 400, 6 xlgj 500, 6 xlgj 630, 8 xlgj 400, 8 xlgj 630, for a total of 6 different types of wires, a number of wire 2 splits from 4 to 8 splits, and a sub-wire diameter from 26.8mm to 36.6 mm; in view of the fact that the influence of the splitting distance of the conductor 2 on the excitation function is small and can be basically ignored under the condition of the same radius and splitting number of the sub-conductors, the fixed splitting distance of the conductor is 400mm when the method is used for testing, and the relation between the conductor type and the diameter of the sub-conductor is shown in the following table:
TABLE 2
S2, converting the measured sound pressure data into sound power by a sound power corona cage analysis method, which specifically includes:
s201, falseSetting corona discharge points on the surface of the lead 2 in the corona cage 1 to be uniformly distributed along the lead 2, and the acoustic power generated by the lead with the dx length to be a constant A0When a wire of dx length is used as a point sound source, noise propagates to the surroundings in the form of spherical waves, and the acoustic energy at a distance D from the wire is calculated as follows in consideration of the reflection of the acoustic waves from the ground:
in the formula, A0The power generated by noise of a wire with a dx length, L is the length of the wire, k is the earth reflection coefficient, D is the distance between the midpoint of the wire and the measuring point, DiThe distance between the line mirror image and the measuring point is taken as the distance;
s202, directly measuring data in a corona cage test to be sound pressure P, wherein the sound pressure and the sound energy have the following relation:
in the formula, delta is relative air density, c is the propagation speed of sound waves in the air, and 344m/s is taken;
s203, performing simultaneous calculation on the formulas (1) and (2) in the steps S201 and S202 to obtain sound pressure P and sound power A0The operational relationship between them is as follows;
in the formula (4), H is an external factor influence parameter;
s204, substituting the measured audible noise sound pressure data P into formula (3) to obtain the sound power level of corona discharge of the wire 2, and comparing the sound power to obtain the audible noise levels generated by corona discharge of different split wire bundles;
s3, fitting the sound power of the wire 2 with different splitting numbers and different sub-wire diameters to obtain a sound power correction method, wherein the correction formula of the sound power correction method is as follows:
in the formula, Δ is an audible noise sound power correction coefficient, and x is an altitude difference between the measurement point and an altitude 23 m;
the method comprises the steps of actually measuring and calculating the audible noise sound power level of 6 lead 2 combinations under the heavy rain condition, carrying out comparative analysis on the measured and calculated audible noise sound power value and the audible noise sound power value in a low-altitude area, and then carrying out regression research to provide an audible noise sound power correction method based on the altitude; compared analysis is carried out by utilizing the correction formula and the actually measured correction coefficient, as shown in fig. 4, it can be seen that the actually measured value is matched with the formula fitting value, and the formula is suitable for correcting the audible noise sound power of a high altitude area with the altitude of less than 4300 m; compared with the method of foreign U.S. BPA, the correction method provided by the invention is more in line with the actual situation, and the ratio of the U.S. BPA correction to the measured value is shown in FIG. 5;
as shown in fig. 6, when calculating the audible noise sound power in the high altitude area of qinghai tibet plateau, the number of splits and the radius of the sub-conductor of the conductor 2 are obtained, then the model is modeled, the electric field strength on the surface of each sub-conductor in the conductor bundle is calculated by using the methods of simulating charge or finite element, etc., then the maximum electric field strength on the surface of each sub-conductor is extracted, the extracted maximum electric field strength on the surface of each sub-conductor is arithmetically averaged to obtain the average maximum electric field strength on the surface of the conductor 2, and then the audible noise sound power value under the high altitude condition is calculated by combining the high altitude correction formula of the qinghai tibet plateau area provided by the present invention.
The invention provides a correction method of the sound power of the corona noise of an alternating current transmission line in the Qinghai-Tibet plateau area, which develops an audible noise corona test from 5 different altitude points from low altitude to high altitude, the audible noise sound power level actual measurement and calculation are carried out on the 6 lead combinations under heavy rain conditions, by carrying out comparative analysis on the audible noise sound power value of each altitude area and carrying out regression research, the audible noise sound power correction method is provided, the accurate correction of the wire corona discharge audible noise level of the high altitude area is realized, and the method is more accurate and reliable, therefore, unnecessary cost increase or over-standard audible noise level caused by inaccurate prediction in the prior art to the project is avoided, support is provided for the construction of alternating current transmission lines in Qinghai-Tibet plateau areas in China, and the method has the characteristics of more comprehensive measurement data and accurate and reliable audible noise prediction.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. A method for correcting corona noise sound power of an alternating current transmission line in a Tibet plateau area is characterized by comprising the following steps:
s1, conducting a corona cage test on the conducting wire at different altitudes, and measuring an audible noise sound pressure value generated by corona discharge by using a B & K noise measuring system;
s2, converting the measured sound pressure data into sound power by a sound power corona cage analysis method;
and S3, fitting the sound power of the wire with different splitting numbers and different diameters of the sub-wires to obtain a sound power correction method.
2. The method for correcting the sound power of the corona noise of the ac transmission line in the qinghai-tibet plateau according to claim 1, wherein the step S1 is to perform a corona cage test on the conducting wire at different altitudes, and a B & K noise measurement system is used to measure the sound pressure value of the audible noise generated by the corona discharge, and the method specifically comprises the following steps:
s101, applying high voltage to the wires in the corona cage through a high-voltage lead in a heavy rain state, and generating high electric field intensity on the surfaces of the wires for simulating corona discharge of an actual high-voltage line;
s102, collecting a sound signal by using a sound pressure sensor in a B & K noise measurement system and converting the sound signal into an electric signal;
s103, collecting the electric signals by using a B & K Data collecting unit in the B & K noise measuring system, monitoring and storing the electric signals through Time Data Recorder software after simple processing, performing FFT (fast Fourier transform) and processing analysis on the measured sound wave signals by selecting Reflex software, eliminating the interference of external environment noise, and obtaining audible noise sound pressure Data generated by wire corona discharge through spectral analysis and calibration.
3. The method according to claim 1, wherein in step S2, the sound pressure data measured by the sound power corona cage analysis method is converted into sound power, and the specific derivation process of the sound power corona cage analysis method includes:
s201, assuming that corona discharge points on the surface of the wire in the corona cage are uniformly distributed along the wire, and the sound power generated by the wire with the dx length is constant A0When a wire of dx length is used as a point sound source, noise propagates to the surroundings in the form of spherical waves, and the acoustic energy at a distance D from the wire is calculated as follows in consideration of the reflection of the acoustic waves from the ground:
in the formula, A0The power generated by noise of the wire with the length of dx, L is the length of the wire, k is the reflection coefficient of the earth, and D is the distance between the midpoint of the wire and the measuring pointDistance of (D)iThe distance between the line mirror image and the measuring point is taken as the distance;
s202, directly measuring data in a corona cage test to be sound pressure P, wherein the sound pressure and the sound energy have the following relation:
in the formula, delta is relative air density, c is the propagation speed of sound waves in the air, and 344m/s is taken;
s203, performing simultaneous calculation on the formulas (1) and (2) in the steps S201 and S202 to obtain sound pressure P and sound power A0The operational relationship between them is as follows;
in the formula (4), H is an external factor influence parameter;
and S204, substituting the measured audible noise sound pressure data P into formula (3) to obtain the sound power level of the corona discharge of the conductor, and comparing the sound power to obtain the audible noise levels generated by the corona discharge of different split conductor bundles.
4. The method for correcting the acoustic power of the corona noise of the ac transmission line in the tibetan plateau of claim 1, wherein the correction formula of the acoustic power correction method in the step S3 is as follows:
in the formula, Δ is an audible noise sound power correction coefficient, and x is an altitude difference between the measurement point and the altitude 23 m.
5. The method for correcting the corona noise sound power of the ac transmission line in the tibetan plateau of claim 1, wherein the different altitudes in step S1 specifically include: wuhan 23m, Tianshui 1100m, Xining 2261m, Hehe 2943m and Yangyu 4300 m.
6. The method for modifying corona noise sound power of ac transmission line in Tibet plateau area according to claim 2, wherein the conducting wire in step S101 is a multi-split conducting wire, the multi-split conducting wire adopts 4 XLGJ 400, 6 XLGJ 500, 6 XLGJ 630, 8 XLGJ 400 and 8 XLGJ 630, the number of the split conducting wires is from 4 to 8, the diameter of the sub-conducting wire is from 26.8mm to 36.6mm, and the distance between the split conducting wires is 400 mm.
7. The method for correcting the sound power of the corona noise of the alternating-current transmission line in the Qinghai-Tibet plateau area according to claim 1, wherein an artificial rain device is erected above the wall of the corona cage, and is provided with a water valve and a spray head, and the water valve and the spray head are used for controlling rainfall.
8. The method according to claim 2, wherein when the corona cage test in step S101 is performed, the high-voltage capacitor is a capacitor having a capacitance of 3333pF, and is three 10000pF capacitors connected in parallel, the rated voltage is 600kV, and the operating environment is outdoor.
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| 陈豫朝等: "基于电晕笼的特高压交流输电线路可听噪声预测方法", 《高电压技术》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116973977A (en) * | 2022-04-24 | 2023-10-31 | 中国人民解放军海军工程大学 | Self-adaptive denoising method for high-speed mobile platform low-frequency electric field target detection |
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